Walk into any T-Mobile store and you are instantly inundated with its trademark fuchsia. We've recently learned two things about that fuchsia: 1) T-Mobile considers the hue to be a "magenta," and 2) they take protecting it very seriously. Last Friday, the company filed a law suit against rival carrier AT&T alleging that the company's new off-contract subsidiary Aio Wireless commandeered T-Mobiles trademark magenta in an effort to confuse consumers.

According to the complaint, "AT&T Inc set up Aio to compete directly with T-Mobile," and Aio's use of the color magenta "is likely to dilute T-Mobile USA, Inc. (TMUS)'s famous magenta color trademark, and to create initial interest confusion."

T-Mobile's combative CEO, John Legere who has never been shy about attacking AT&T has taken to Twitter to mock his company's rival.

Aio then took to the microblogging service to say that T-Mobile "needs an art lesson. We don't do magenta," followed by the hashtag #Plum.

See if you can tell the difference in the puple-y hues with these two screenshots from the respective companies' websites:

Aio launched earlier this year to offers pre-paid, off-contract wireless service on AT&T's networks. The company offers similar options to T-Mobile's unsubsidizedA Simple ChoiceA plans, which have helped T-Mobile make a noticeableA dent in the mobile market. Aio is currently only available in a few cities throughout the south, but promises to expand nationwide in the coming year.